Zoe Henshaw, of Nottingham Road, Ilkeston, subjected the dog to "wilful neglect" to the point it "looked like a skeleton", a court heard.
As well as the lifetime ban, the 21-year-old was given an eight-week jail sentence, suspended for a year, and ordered to carry out 100 hours of unpaid work. She must also pay £250 prosecution costs and an £80 government surcharge.
Derby magistrate Beth Richardson told Henshaw: "You subjected this dog to wilful neglect over a sustained period. Not only was the dog living in filthy conditions but it was almost dying of starvation and was within a few days of death if it had not been found."
Henshaw pleaded guilty to causing unnecessary suffering by failing to provide adequate nutrition between March 27 and April 17 last year.
She also admitted keeping the animal – called Tyson – in a dirty environment and failing to make arrangements for its care during her absence.
The court heard the dog's weight had nearly doubled since being rehomed.
John Sutcliffe, for the RSPCA, said the charity spoke to Henshaw in October 2011 but she had declined to hand over the dog to them.
In the spring of last year, Henshaw's family raised concerns about the dog's condition, with one relative telling the animal charity it "looked like a skeleton" and no longer resembled a Staffordshire Bull Terrier.
The court heard floors and stairs were covered in faeces, the dog's ribs and spine were visible and it had very little muscle on its legs.
The animal was found to be 4.3kg when checked by a vet, who said its weight should have been between 12 and 16kg.
In a report, the vet said: "The dog suffered prolonged neglect which amounted to cruelty. It would have taken at least three months for the dog to get into that condition. If the dog had not been found on April 17, it would have died of starvation in the next day or so."
Stacey Mighty, for Henshaw, said she had personal problems at the time and is a "young girl who is very naive".
(thisisderbyshire.co.uk - Aug 5, 2013)
